81155422 has 8 divisors (see below), whose sum is σ = 128140200. Its totient is φ = 38442024.

The previous prime is 81155411. The next prime is 81155423. The reversal of 81155422 is 22455118.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81155423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1067797 + ... + 1067872.

It is an arithmetic number, because the mean of its divisors is an integer number (16017525).

Almost surely, 2^81155422 is an apocalyptic number.

81155422 is a deficient number, since it is larger than the sum of its proper divisors (46984778).

81155422 is a wasteful number, since it uses less digits than its factorization.

81155422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2135690.

The product of its digits is 3200, while the sum is 28.

The square root of 81155422 is about 9008.6304175496. The cubic root of 81155422 is about 432.9514317034.

The spelling of 81155422 in words is "eighty-one million, one hundred fifty-five thousand, four hundred twenty-two".